<template>
  <div class="article-container">
    <van-nav-bar
      class="app-nav-bar"
      title="文章详情"
      left-arrow
      @click-left="$router.back()"
    />
    <div class="article-wrap">
      <h1 class="title">{{ article.title }}</h1>
      <van-cell center class="user-info">
        <div slot="title" class="name">{{article.aut_name}}</div>
        <van-image
          slot="icon"
          class="avatar"
          width="35"
          height="35"
          round
          fit="cover"
          :src="article.aut_photo"
        />
        <div slot="label" class="pubdate">{{article.pubdate | relativeTime }}</div>
        <van-button
          class="follow-btn"
          :type="article.is_followed ? 'default': 'info' "
          :icon="article.is_followed ? '' : 'plus' "
          round
          size="small"
          :loading="isFollowLoading"
          @click="onFollow"
        >{{article.is_followed ? '已关注' : '关注'}}</van-button>
      </van-cell>
      <div class="markdown-body"
      v-html="article.content"
      ref="article-content"></div>
      <!-- 文章评论列表 -->
      <comment-list
      :source="articleId"
      :list="commentList"
      @update-total-count="totalCommentCount = $event"
      @reply-click="onReplyClick"></comment-list>
    </div>
    <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = true"
      >写评论</van-button>
      <van-icon
        name="comment-o"
        :badge="totalCommentCount"
        color="#777"/>
      <van-icon
        :color= "article.is_collected ? 'orange': '#777' "
        :name=" article.is_collected ? 'star': 'star-o' "
        @click="onCollect" />
      <van-icon
        :color="article.attitude === 1 ? 'hotpink' : '#777' "
        :name="article.attitude === 1 ? 'good-job' : 'good-job-o'"
        @click="onLike" />
        <van-icon name="share" color="#777"></van-icon>
    </div>
    <!-- 发布评论 弹出层 -->
    <van-popup
      v-model="isPostShow"
      position="bottom" >
      <post-comment
      :target="articleId"
      @post-success="onPostSuccess"></post-comment>
    </van-popup>
        <!-- 评论 回复 弹出层 -->
    <van-popup
      v-model="isReplyShow"
      position="bottom" >
        <comment-replay
        v-if="isReplyShow"
        :comment="replyComment"
        :article-id="articleId"
        @close="isReplyShow = false" />
    </van-popup>
  </div>
</template>

<script>
import './github-markdown.css'
import { getArticleById, addCollect, deleteCollect, addLike, deleteLike } from '@/api/article'
import { ImagePreview } from 'vant'
import { addFollow, deleteFollow } from '@/api/user'
import CommentList from './components/comment-list'
import PostComment from './components/post-comment'
import CommentReplay from './components/comment-replay'

export default {
  name: 'ArticleIndex',
  // 在组件中获取动态路由参
  // 1. this.$route.params.xxx
  // 2. props传递参数
  props: {
    articleId: {
      type: [String, Number, Object],
      required: true
    }
  },
  components: {
    CommentList,
    PostComment,
    CommentReplay
  },
  data () {
    return {
      article: {},
      isFollowLoading: false,
      isCollectLoading: false,
      isPostShow: false,
      commentList: [],
      totalCommentCount: 0,
      isReplyShow: false,
      replyComment: {}
    }
  },
  created () {
    this.loadArticle()
  },
  methods: {
    async loadArticle () {
      const { data } = await getArticleById(this.articleId)
      this.article = data.data
      // 得到所有的img标签
      this.$nextTick(() => {
        this.handlePreviewImage()
      })
    },
    handlePreviewImage () {
      // 获取文章内容DOM容器
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const imgPaths = []
      // 循环img列表 给img注册点击事件
      imgs.forEach((img, index) => {
        imgPaths.push(img.src)
        img.onclick = function () {
          // 在事件处理函数中调用 ImagePreview()
          ImagePreview({
            images: imgPaths,
            startPosition: index
          })
        }
      })
    },
    async onFollow () {
      this.isFollowLoading = true
      if (this.article.is_followed) {
        // 已关注 取消关注
        await deleteFollow(this.article.aut_id)
      } else {
        // 没有关注 添加关注
        await addFollow(this.article.aut_id)
      }
      this.article.is_followed = !this.article.is_followed
      this.isFollowLoading = false
    },
    async onCollect () {
      this.$toast.loading({
        message: '操作中...',
        forbidClick: true // 禁止背景点击
      })
      if (this.article.is_collected) {
        // 已收藏 取消收藏
        await deleteCollect(this.articleId)
      } else {
        // 没有收藏 添加收藏
        await addCollect(this.articleId)
      }
      this.article.is_collected = !this.article.is_collected
      this.$toast.success(`${this.article.is_collected ? '' : '取消'}收藏成功`)
    },
    async onLike () {
      this.$toast.loading({
        message: '操作中...',
        forbidClick: true // 禁止背景点击
      })
      if (this.article.attitude === 1) {
        // 已点赞 取消点赞
        await deleteLike(this.articleId)
        this.article.attitude = -1
      } else {
        // 没有点赞 添加点赞
        await addLike(this.articleId)
        this.article.attitude = 1
      }
      this.$toast.success(`${this.article.attitude === 1 ? '' : '取消'}点赞成功`)
    },
    onPostSuccess (comment) {
      this.commentList.unshift(comment)
      this.totalCommentCount++
      this.isPostShow = false
    },
    onReplyClick (comment) {
      // console.log('onReplyClick', comment)
      this.replyComment = comment
      this.isReplyShow = true
    }
  }
}
</script>

<style lang="less" scoped>
  .article-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 46px;
    bottom: 44px;
    overflow-y: auto;
  }
  .title {
    font-size: 20px;
    color: #3a3a3a;
    padding: 14px;
    background-color: #fff;
    margin: 0;
  }
  .user-info{
    .avatar {
      width: 35px;
      height: 35px;
      margin-right: 8px;
    }
    .name {
      font-size: 12px;
      color: #333;
    }
    .pubdate {
      font-size: 11px;
      color:#b4b4b4;
    }
    .follow-btn {
      width: 85px;
      height: 29px;
    }
  }
  ul {
    list-style: unset;
  }

  .markdown-body{
    padding: 14px;
    background-color: #fff;
    list-style: unset;
  }

  .article-bottom {
    position:fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 44px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn{
      width: 141px;
      height: 23px;
      border: 1px solid #eee;
      font-size: 15px;
      line-height: 23px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 20px;
      .van-icon {
        font-size: 11px;
        background-color: #e22829;
      }
    }
  }
</style>
